// macros for the actual printing

#define BYTE_TO_BINARY_PATTERN "%c%c%c%c%c%c%c%c"
#define BYTE_TO_BINARY(byte)                    \
                (byte & 0x80 ? '1' : '0'),      \
                (byte & 0x40 ? '1' : '0'),      \
                (byte & 0x20 ? '1' : '0'),      \
                (byte & 0x10 ? '1' : '0'),      \
                (byte & 0x08 ? '1' : '0'),      \
                (byte & 0x04 ? '1' : '0'),      \
                (byte & 0x02 ? '1' : '0'),      \
                (byte & 0x01 ? '1' : '0')

// input

        int b = 1234123;
        binary_print(b, sizeof(b));


// relevant source

void binary_print(int data, size_t data_len)
{
        size_t i;
        unsigned int byte_shift = data_len * 8;

/*
        while (1) {
                printf(BYTE_TO_BINARY_PATTERN" ", BYTE_TO_BINARY(*data>>byte_shift));
                byte_shift = byte_shift-8;
                if (byte_shift == 0)
                        break;
        }
*/

        for (i = 0; i < data_len; i++) {
                printf(BYTE_TO_BINARY_PATTERN" ", BYTE_TO_BINARY(data>>byte_shift));
                byte_shift = byte_shift-8;
        }
        printf("\n");
}


// output

>>> ./a.out
11001011 00000000 00010010 11010100